问题
解答题
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答案
(1)x:
=8:2,5 2
2x=
×8,5 2
2x=20,
2x÷2=20÷2,
x=10;
(2)x-20%x=20,
80%x=20,
80%x÷80%=20÷80%,
x=25.
|
(1)x:
=8:2,5 2
2x=
×8,5 2
2x=20,
2x÷2=20÷2,
x=10;
(2)x-20%x=20,
80%x=20,
80%x÷80%=20÷80%,
x=25.